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Our Samsung M2835 printer's drum unit (MLT-R116, not toner, the drum unit) finally hit its software-programmed end-of-life of 10,000 pages. This is annoying for several reasons :

  Page 9,999 was perfectly fine
  I disagree with business practices involving software-enforced obsolescence 
  Other printers (Brother and HP) provide an option to reset the page count

After some research, it turns out drum unit uses the same technique as toner cartridges to enforce end-of-life. It uses a small 4Kbit i2c EEPROM to store the page count.

There are some great resources for resetting almost the same EEPROM on toner cartridges on Samsung printers. I used and adapted these to reset the drum counter.

Here's the Chip with contacts soldered to it so I can plug it into my raspberry Pi. So once connected, dumping and re-writing the ROM is easy. Use the above links to enable i2c on the RPI and then:

    python -b 0x50.bin --addr 0x50
    python -b 0x51.bin --addr 0x51
    bvi 0x50.bin
        Change offset 0x0C to 00 00 00 00  # See Note Below!
    python -r 0x50.bin --addr 0x50

Now the drum counter reports 0 and the printer will print again. Note: from what I have been reading, some versions of the firmware require modifications to other offsets too. It's probably easiest to take a snapshot of the eeprom, save it somewhere safe, and then reload the eeprom 5 years later when the page counter is too high.

Note: Thanks to Joe Cooper, you may also, or instead, have to reset bytes of the 0x50.bin starting at 0x26 to 00 00, and at 0x2E to 00 00. It's possible different printer models/firmware are storing the page count at different offsets.

  • mlt-r116.txt
  • Dernière modification : 2020/12/29 15:19
  • de chabrol